Underfloor Heating Electrical Reference Pack

Underfloor Heating Electrical Wiring Reference

Overview

Underfloor heating systems use zone controllers and actuators to regulate heating in individual rooms or areas.

Main Components

• Boiler (or heat source)
• UFH control manifold with actuators
• Zone controller
• Room thermostats
• Pump
• Wiring centre / control box

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System Operation

• Each room thermostat controls an actuator on the manifold.
• When a zone calls for heat, actuators open.
• Pump and boiler are triggered via control module.

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Wiring Concept

• Thermostats send signal to zone controller
• Zone controller activates actuators
• Boiler and pump receive combined demand signal

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Key Wiring Points

• Actuators may be 230V or 24V (must be confirmed)
• Each zone must be correctly assigned
• Pump and boiler interlock via controller output
• Keep low voltage and mains voltage separated where required

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Common Fault Areas

• Incorrect actuator voltage mismatch
• One zone not heating (failed actuator)
• Incorrect thermostat pairing
• No pump operation on demand
• Wiring centre misconfiguration
• Airlock or hydraulic issues mistaken for electrical faults

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Notes

• Always confirm actuator voltage before replacement.
• UFH faults are often mixed electrical/hydraulic issues.